Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi2MnO3-(1-x)LiMO2 cathode material

PENG Jiming; CHEN Yuhua; LIU Shicheng; HU Sijiang; WANG Hongqiang; LI Qingyu

doi:10.11949/j.issn.0438-1157.20151501

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Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material

更新时间：2025-11-26

- Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material
- CIESC Journal Issue 7, Pages: 2950-2955(2016)
- 作者机构：
  
  1. 黄冈师范学院化工学院, 催化材料制备及应用湖北省重点实验室,湖北,黄冈,438000
  2. 广西师范大学化学与药学学院, 低碳能源材料广西重点实验室,广西,桂林,541004
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151501
  CLC： M912.9
- Online First：05 July 2016，
  
  Published：05 July 2016
- 稿件说明：
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PENG Jiming, CHEN Yuhua, LIU Shicheng, et al. Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material[J]. CIESC Journal, 2016, (7): 2950-2955. DOI: 10.11949/j.issn.0438-1157.20151501.
DOI：

PENG Jiming, CHEN Yuhua, LIU Shicheng, et al. Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material[J]. CIESC Journal, 2016, (7): 2950-2955. DOI: 10.11949/j.issn.0438-1157.20151501. DOI：

摘要

以NaOH和NH3·H2O为沉淀剂，采用共沉淀法成功合成富锂锰基层状正极材料。通过X射线粉末衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）、循环伏安法（CV）、电化学阻抗谱（EIS）和充放电测试等研究手段，重点探讨了不同镍钴锰比对富锂锰基层状正极材料的结构、形貌以及电化学性能的影响。其中Li1.2Mn0.54Ni0.13Co0.13O2正极材料结晶度高，粒度分布均匀，无明显团聚现象。在0.1C倍率下首次放电比容量为247.9 mA·h·g-1，首次库仑效率为75.1%。在1C倍率下首次放电比容量为236.2 mA·h·g-1，经过50次充放电循环后放电比容量为218.4 mA·h·g-1，容量保持率为88.3%，展现出较好的循环稳定性。

Abstract

Li-rich layered cathode materials were synthesized by a facile co-precipitation method with NaOH and NH3·H2O. The effect of Ni/Co/Mn molar ratio on the structure

morphology and electrochemical properties of the as-prepared material were intensively investigated through X-ray diffraction (XRD)

Raman spectra

scanning electron microscopy (SEM)

cyclic voltammetry (CV)

electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge tests. The Li1.2Mn0.54Ni0.13Co0.13O2 sample had good crystallity

uniform distribution of particle size and excellent electrochemical performance. It delivered the largest initial discharge capacity (247.9 mA·h·g-1) and coulombic efficiency (75.1%) at 0.1C-rate. Furthermore

it showed a high discharge capacity of 236.2 mA·h·g-1 at 1C-rate and a capacity retention of 88.3% after 50 cycles.

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